CN108916439B - Flow automatic control ball valve and flow automatic control method - Google Patents
Flow automatic control ball valve and flow automatic control method Download PDFInfo
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- CN108916439B CN108916439B CN201810739028.5A CN201810739028A CN108916439B CN 108916439 B CN108916439 B CN 108916439B CN 201810739028 A CN201810739028 A CN 201810739028A CN 108916439 B CN108916439 B CN 108916439B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
- F16K17/28—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
- F16K17/30—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only spring-loaded
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
A kind of flow automatic control ball valve and flow automatic control method have ball valve and uniform-pressure-drop valve；Ball valve includes: the four-way valve body with upper and lower, left three face cylinders, is equipped with valve seat, sphere and upper valve rod in valve body, is mounted on the right cap with cylinder of valve body right end；Sphere lower end is equipped with a blind hole, and ball wall is equipped with throttle orifice on the left of sphere, and right side ball wall position to the left is equipped with the water inlet of ellipse；Rotation upper valve rod is the aperture for being adjustable throttle orifice；Before uniform-pressure-drop valve is connected on throttle orifice, slide valve including slide fit in blind hole, the diaphragm being mounted between valve body lower end face and bottom cover, slide valve is connected with diaphragm；The differential pressure adjusting device being made of screw press, pressure regulation swivel nut and spring etc. is equipped in cavity between bottom cover and diaphragm；When medium passes through throttle orifice, since the pressure compensation of uniform-pressure-drop valve acts on, even if inlet and outlet hydraulic pressure fluctuates, the pressure difference for being also able to maintain throttle orifice both ends is remained unchanged, to guarantee that the flow passed through is constant.
Description
Technical field
The present invention relates to flow control valve field, especially a kind of flow automatic control ball valve and flow automatic control method.
Background technique
Ball valve is adjusting flow in recent years since it has many advantages, such as compact-sized, good seal performance and easy to operate
Be functionally widely used.Because being processed on the ball wall of hollow sphere logical with certain discharge characteristic shape
Hole just can easily realize sphere relative opening degree and the functional relation by flow, and ball valve is made to have certain discharge characteristic, such as
Straight line discharge characteristic, equal percentage flow characteristic, quick open flow characteristic and parabolic flow character etc..Such as in air-conditioning system
In, control system generally uses Linear Control, and the specific method is as follows: the characteristic of coil pipe is just to have started small flow input to draw
Big heat output is played, then as the flow rate increases, and heat output voltage gradient can gradually ease up, and equal percentage ball valve is opened just
Small flow is only provided when the beginning, then as the increase of aperture, the slope of output flow are gradually increased, the two is compensated mutually, multiple
Synthesizing linear.
There is the aperture when sphere in the flow control methods of this ball valve, i.e., after the opening area of hole (throttle orifice) determines,
If the pressure oscillation of import or export causes hole front and back pressure difference to change, the flow for flowing through hole is wanted when being no longer former design
The desired flow rate of asked, but change with pressure difference and fluctuate, especially in the lesser situation of pressure difference before and after hole, it will cause sky in this way
Adjusting system is out of control, keeps the temperature of environment sometimes hot and sometimes cold, user is allowed not feel well, and cause energy waste, therefore, design
When ball valve import or export pressure oscillation, pressure difference remains unchanged one kind after Kong Qiankong, and it is out of control not will cause air-conditioning system in this way,
User is allowed to feel comfortable, energy saving flow automatic control ball valve and flow automatic control method become urgent problem to be solved.
Summary of the invention
The purpose of the invention is to overcome above-mentioned ball valve to there is the aperture when sphere, the i.e. opening area of hole (throttle orifice)
After determination, if the pressure oscillation of import or export causes hole front and back pressure difference to change, it is no longer former for flowing through the flow in hole
The desired flow rate of of design requirement, but change with pressure difference and fluctuate, especially in the lesser situation of pressure difference before and after hole, it will make
It is out of control at air-conditioning system, keep the temperature of environment sometimes hot and sometimes cold, user is allowed not feel well, and causes energy waste not
Foot, provides a kind of when the pressure oscillation of ball valve import or export, and pressure difference remains unchanged after Kong Qiankong, not will cause air-conditioning system
It is out of control, allow user to feel comfortable, energy saving flow automatic control ball valve and flow automatic control method.
The specific technical solution of the present invention is:
A kind of flow automatic control ball valve, has ball valve and uniform-pressure-drop valve, and ball valve has four-way valve body 1, valve body right end through-hole
Outside be annular end face, the through-hole of valve body left end cylinder is apopore E, be located on same level axis with right end through-hole,
On same vertical axis, two axis intersect vertically the through-hole of upper and lower cylinder, have one on the inner wall of the right side apopore E inner cavity
Circular pit inside sets valve seat 3, and sphere 2 is equipped in the chamber of valve body 1, is equipped with upper valve rod 5 in the hole of upper shell；Under the valve body 1
The neck of through-hole cylinder has one G1 of convex block, and vertical aperture h1 is drilled on convex block one, and the vertical aperture is connected to apopore E；Institute
It states and is machined with the throttle orifice H with certain discharge characteristic on the appropriate location of 2 left side ball wall of sphere, right side ball wall appropriate position to the left
Set the water inlet d for being machined with ellipse；Before the uniform-pressure-drop valve is connected on throttle orifice H, including it is mounted on 1 lower end surface of valve body
Diaphragm 14 between bottom cover 13, the slide valve 12 being connected with diaphragm, in six C6 of cavity between bottom cover 13 and diaphragm 14
Equipped with regulator.
Preferably, there is a blind hole in the lower end of the sphere 2, the center line of blind hole is consistent with the vertical center line of sphere 2,
Left and right side is respectively equipped with symmetrical, three C3 of cavity of the identical spherical crown shape of shape and spherical crown shape seven G7 of cavity, two cavitys
Center line it is consistent with the horizontal center line of sphere 2, and communicated respectively by elongated slot a and flat hole b with blind hole, elongated slot a is from blind hole
Bottom extend to aperture；The throttle orifice H is communicated with three C3 of body of spherical crown shape chamber, the water inlet d and spherical crown shape
Seven C7 of cavity is communicated.
Preferably, the slide valve 12 is made of piston and lower valve rod, there are two have certain intervals, diameter identical to top tool
And in the piston of same center line, two piston centres have small axis to be connected, and spacing distance is greater than flat hole b width, two-piston
Between formed five C5 of ring-shaped cavity；For the piston slide fit in the blind hole of sphere 2, top land has a small boss, so that cavity three
C3 is communicated by elongated slot a with four C4 of cavity of top land when slide valve 12 is located at top.
Preferably, the relative position of the throttle orifice H and water inlet d is: when throttle orifice H standard-sized sheet, the one of water inlet d
Side is overlapped with the internal diameter of valve seat 3；When rotating sphere 2, after throttle orifice H is completely closed, the another side of water inlet d and 3 internal diameter of valve seat
Another side be overlapped.
Preferably, the slide valve lower valve rod is by the stud of end and nut 2 24 by pressing plate 27, spring base 25 and film
Piece 14 is connected, and the edge of diaphragm 14 is sandwiched between the flange of 1 lower end of valve body and the flange of bottom cover 13, and by several pairs of spiral shells
Bolt 15, gasket 16 and nut 17 are pressed in the annular groove of 1 lower flange end face of valve body；Cavity six between bottom cover 13 and diaphragm 14
Regulator, including screw press 22, the pressure regulation swivel nut 19 and spring 18 screwed with screw press: the bottom cover 13 are equipped in C6
Flange be equipped with two G2 of convex block, be drilled with above connection aperture h2, be connected with the vertical aperture h1 of valve body 1, and be drilled with radially it is small
Hole h3 makes apopore E be connected to six C6 of cavity；The outer end for connecting aperture h2 and radial hole h3 is blocked with ball 26；Plane axis
20 are held to mitigate torque when rotation screw press 22；The sphere upper end is equipped with groove；5 lower end of upper valve rod be equipped with it is recessed
The cotter pilotage of slot clearance fit has certain amount of movement conducive to sphere is made in the horizontal direction when compressing sphere 2.
A kind of flow automatic control method of flow automatic control ball valve, the flow automatic control ball valve have above-mentioned flow from ball-handling
The limiting structure of valve, before (1) water flowing, slide valve 12 rises to extreme higher position under the action of spring 18, at this time valve port V standard-sized sheet；
After water flowing, pressure water enters the chamber before throttle orifice H through water inlet d, seven C7 of cavity, flat hole b, annular housing five C5 and elongated slot a
Three C3 of body, and two C2 of four C4 of cavity and cavity is entered by elongated slot a, the pressure water action in four C4 of cavity is in slide valve 12
Top, the pressure water action in two C2 of cavity is in the top of diaphragm 14, since diaphragm 14 and slide valve 12 are connected,
Therefore it is moved downward with movable pulley 12, valve port V is turned down, and throttling action increases, and makes the pressure in three C3 of cavity lower than inlet opening I's
Pressure, meanwhile, the pressure water of apopore E is through vertical aperture h1, connection aperture h2 and radial hole h3 after throttle orifice H, into chamber
In six C6 of body, the lower section of diaphragm 14 is acted on, it is sliding when the setting dynamic balance for the power and spring 18 for acting on diaphragm upper and lower
Valve 12 is in ideal design position, at this point, pressure difference △ P=F/S before and after throttle orifice H, the setting power of F- spring 18, S- in formula
The active area of diaphragm 14；(2) when intake pressure P1 is increased, since the moment slide valve 12 in pressure rise has little time to move
Make, therefore the pressure in three C3 of cavity also increases, the pressure in two C2 of four C4 of cavity and cavity also accordingly increases, and acts on
The power of 14 top of 12 top of slide valve and diaphragm increases, and the stress balance of slide valve 12 is destroyed, and slide valve 12 moves down, valve port
V reduces, and throttling action increases, and the pressure in three C3 of cavity decreases, until restoring to original value, keeps △ P=P2- P3 not
Become；Conversely, the pressure in three C3 of cavity also decreases, and slide valve 12 is under the promotion of spring 18 when intake pressure P1 is reduced
Rise, valve port V increases, and throttling action weakens, the pressure rise in three C3 of cavity, until restoring to original value；(3) work as throttle orifice
When the pressure P3 of apopore E is increased after H, pass through the pressure in vertical aperture h1, connection aperture h2, radial hole h3, six C6 of cavity
Power is synchronous to be increased, and diaphragm 14 and slide valve 12 is pushed to move upwards, and valve port V increases, and throttling action weakens, the pressure in three C3 of cavity
It increases, remains unchanged △ P=P2- P3；Conversely, slide valve 12 moves downward, valve when the pressure P3 of apopore E is reduced
Mouth turns down, and the pressure in three C3 of cavity decreases, and remains unchanged △ P=P2-P3；(4) the pressure water of inlet opening I is through intaking
Mouth d, seven C7 of cavity, flat hole b, cavity C5, elongated slot a, throttle orifice H and apopore E downstream supply water, since uniform-pressure-drop valve is to section
The pressure at bis- end discharge orifice H carries out pressure compensation, therefore regardless of import and export hydraulic pressure fluctuates, can make the pressure difference before and after throttle orifice H
It remains unchanged, therefore stable flow can be maintained；(5) pressure difference at bis- end throttle orifice H can pass through the precompression of adjustment spring 18
It sets, rotates screw press 22, pressure regulation swivel nut 19 can be made to move up and down, to reach the precompression of adjustment spring 18.
Compared with prior art, the beneficial effects of the present invention are: in the flow automatic control ball valve use process, when ball valve import
Or outlet water pressure fluctuations when, by be set to throttle orifice H before uniform-pressure-drop valve carry out pressure compensation, make throttle orifice H Kong Qiankong
Pressure difference afterwards remains unchanged, to guarantee that output flow is kept constant, it is out of control not will cause air-conditioning system, and user is allowed to feel easypro
Clothes, and it is energy saving.
Detailed description of the invention
Attached drawing 1 is a kind of longitudinal sectional view of the invention；
Attached drawing 2 is the A-A view of Fig. 1；
Attached drawing 3 is M direction view, the shape in aperture and position when throttle orifice H standard-sized sheet；
Attached drawing 4 is N direction view, the shape of water inlet d and position when throttle orifice H standard-sized sheet；
Attached drawing 5 is M direction view, and when throttle orifice H is fully closed, valve is closed；
Attached drawing 6 is N direction view, when throttle orifice H is fully closed, the position of water inlet d.
Description of symbols: 1, valve body, 2, sphere, 3, valve seat, 4, O-shaped shape sealing ring one, 5, upper valve rod, 6, swivel nut, 7,
Gasket, 8, O-ring seals two, 9, screw, 10, spring washer, 11, right cap, 12 slide valves, 13 bottom covers, 14, diaphragm, 15, bolt, 16,
Washer, 17, nut one, 18, spring, 19, pressure regulation swivel nut, 20, plane bearing, 21, O-ring seals three, 22, screw press, 23,
Protective cover, 24, nut two, 25, spring base, 26, ball, 27, pressing plate, 28, O-ring seals four, I, inlet opening, E, apopore,
G1, convex block one, G2, convex block two, H, throttle orifice, V, valve port, h1, vertical aperture, h2, connection aperture, h3, radial hole, a,
Vertical elongated slot, d, water inlet, b, flat hole, C1~C7, one~cavity of cavity seven.
Specific embodiment
The present invention is described further shown in reference to the accompanying drawing.
As shown in attached drawing 1 to attached drawing 6, the present invention is made of ball valve and two part of uniform-pressure-drop valve.
Ball valve is by valve body 1, sphere 2, valve seat 3, O-shaped shape sealing ring 4, upper valve rod 5, swivel nut 6, gasket 7, O-ring seals
The parts such as 28 and right cap 11 composition.Valve body 1 is a four-way valve body, and the through-hole of left end cylinder is apopore E, logical with right end
Hole is located on same level axis, and on same vertical axis, two axis intersect vertically the through-hole of upper lower shell, and apopore E is right
Holding on the inner wall of inner cavity has a circular pit, and the flange of left end is connected with the respective flange of downstream line, for small-aperture ball valve
Threaded connection can be used；The diameter of 1 right end through-hole of valve body is slightly larger than the diameter of sphere 2, to be packed into 3 He of valve seat in assembly
Sphere 2；The right end of valve body 1 has an annular end face, and the center line of annular end face is consistent with the horizontal center line of valve body 1, on end face
There are 6~8 uniformly distributed screw holes；It is equipped with two C2 of cavity in the lower through-hole of valve body 1, has one G1 of convex block, convex block one in the neck of cylinder
It is drilled with elongated vertical aperture h1 on G1, is connected to apopore E, and vertical with the flange face of lower end；On the lower end surface of lower flange
It is machined with annular groove.
The middle part of right cap 11 is a cylinder, and center is equipped with inlet opening I, and diameter is consistent with the diameter of apopore E, and
On same level center line；Two ends are flanges, and the flange of right end and the respective flange of upstream line connect, for small-bore ball
Threaded connection can be used in valve；The outer diameter of left end flange is consistent with the outer diameter of 1 right end annular end face of valve body, there is 6~8 on flange
Uniformly distributed through-hole is matched with 6~8 screw holes on 1 right end annular end face of valve body；There is a circular boss on the left side of left end flange,
The slide fit of boss outer diameter and 1 right end through-hole of valve body, the outer circle of boss, which is got on the bus, the groove of installation O-ring seals, and there is a circle at center
Shape pit；By several pairs of screws 9 and spring washer 10, right cap 11 is fixed on the annular end face of 1 right end of valve body；The sealing of O shape
28 are enclosed to prevent medium from leaking outside, sphere 2 is arranged in one C1 of internal cavity after valve body 1 and the connection of side cover 11.
Valve seat 3 also plays sealing function, by polymeric material, such as polytetrafluoroethylene (PTFE) elastomeric material system
At the internal diameter of valve seat 3 is more bigger than the diameter of apopore E；Two valve seats 3 are separately positioned on 1 apopore E right end internal chamber wall of valve body
And in the 11 corresponding circular pit in left end boss center of side cover；By adjusting the thickness of gasket 7, adjusted by several pairs of screws 9 Deng
To the compression degree of sphere 2, not only guarantee to seal but also guarantee rotating torque appropriate, its center is located substantially on after the positioning of sphere 2
On the intersection point of 1 horizontal axis of valve body and vertical axis；After two valve seats 3 are installed, longitudinal size is more bigger than lateral dimension, this is to examine
Consider the throttle orifice H that can arrange special-shaped over a larger area and the appropriate rotational angle for increasing sphere.
In the dynamic upper through-hole for fitting over valve body 1 of valve rod 5, there are a cotter pilotage, the groove of 2 top of two sides and sphere of cotter pilotage in lower end
Pine is matched, slightly gap, has certain amount of movement to make it in the horizontal direction when compressing sphere 2；The small axis and handle of upper end
Or motor connection, drive sphere 2 to rotate by rotation valve rod 5, to adjust the aperture of throttle orifice H；Swivel nut 6 is to limit valve rod 5
Axial position；O-ring seals 1 are to prevent medium from leaking outside；The flange of through-hole upper end is used to install motor on valve body 1
Or the instruction disk of 2 aperture of sphere.
There is a blind hole in the lower end of sphere 2, and center line is consistent with the vertical center line of sphere 2；Left and right side is respectively equipped with
Symmetrically, identical three C3 of spherical crown shape cavity and seven G7 of shape, center line is consistent with the horizontal line of sphere 2, and passes through length respectively
Slot a and flat hole b are communicated with blind hole, and elongated slot a extends to aperture from the bottom of blind hole；Add on the appropriate location of left side ball wall
Work has the throttle orifice H with certain discharge characteristic, as shown in figure 3, communicating with three C3 of cavity；The ball wall position processing to the left on right side
There is water inlet d, as shown in figure 4, communicating with seven C7 of cavity；The relative position of throttle orifice H and water inlet d are: when throttle orifice H standard-sized sheet
When, one side of water inlet d is overlapped (Fig. 4) with the internal diameter of valve seat 3, when rotating sphere 2, after throttle orifice H is completely closed (Fig. 5),
The another side of water inlet d is overlapped (Fig. 6) with the another side of 3 internal diameter of valve seat；The top of sphere 2 is machined with slot, the symmetrical plane of slot
By the vertical center line of sphere 2, the rotation axis to guarantee sphere 2 is consistent with the vertical center line of sphere 2.Ball in order to prevent
When body 2 rotates, the edge cutting elastomeric valve seat 3 of throttle orifice H and discharge outlet d, there is smooth rounding at the edge in two holes.
Uniform-pressure-drop valve have bottom cover 13, diaphragm 14, spring 18, pressure regulation swivel nut 19, plane bearing 20, O-ring seals 3 21,
Screw press 22, protective cover 23, nut 2 24, spring base 25, ball 26, pressing plate 27, O-ring seals 4 28, slide valve 12 and ball
The equal parts composition of body 2.
Slide valve 12 is made of piston and lower valve rod, and there are two to have certain intervals, diameter identical and same center line on top
Piston, there is a small axis connection at center, and spacing distance is greater than the width of flat hole b, therefore two piston spaces have five C5 of ring-shaped cavity
；For piston slide fit in the blind hole of sphere 2, top land has a small boss, so that three C3 of cavity leads to when slide valve 12 is located at top
Elongated slot a is crossed to communicate with four C4 of cavity of top land；Lower valve rod is by the stud of end and nut 2 24 by pressing plate 27, spring base
25 are connected with diaphragm 14, and the edge of diaphragm 14 is sandwiched between the flange of 1 lower end of valve body and the flange of bottom cover 13, and if by
Dry bolt 15, gasket 16 and the nut 1 paid is pressed in the annular groove of 1 lower flange end face of valve body, has both secured diaphragm 14,
Sealing function is played again；Screw press 22, pressure regulation swivel nut 19 and spring 18 are equipped in six C6 of cavity between bottom cover 13 and diaphragm 14
Deng plane bearing 20 is to mitigate turning moment when pressure regulation, and O-ring seals 3 21 are to prevent medium from leaking outside；Bottom cover 13
There is two G2 of convex block on flange, is drilled with connection aperture h2 above and is connected with the vertical aperture h1 on valve body 1, and be drilled with radial hole
H3 makes to connect aperture h2 connection six C6 of cavity；In this way, apopore E passes through vertical aperture h1, connection aperture h2 and diameter after mounting
It is communicated to aperture h3 with six C6 of cavity, the outer end of connection aperture h2 and radial hole h3 is blocked after boring with ball 26；O-ring seals
4 28 to prevent medium from leaking outside.From the foregoing, it can be seen that uniform-pressure-drop valve is divided into two chamber of C2 and C6 or more, two C2 of cavity by diaphragm 14
It is communicated by elongated slot a with three C3 of cavity before throttle orifice H, and six C6 of cavity is communicated with the apopore E after throttle orifice H.
Working principle
Rotating sphere 2, the opening area of throttle orifice H is from large to small up to closing, or changes from small to big until standard-sized sheet.When with
When in air-conditioning system, throttle orifice H opening size by be controlled environment temperature determine, it is desirable that when temperature is high, by hot water
Just more, aperture is with regard to big, conversely, aperture is with regard to small.When sphere 2 be located in it is a certain require position when, throttle orifice H opening size just
It has been determined that the flow passed through in this way is also constant, thus not since the present invention can guarantee that the pressure difference before and after throttle orifice H remains unchanged
By the influence of fluctuations into and out of water hole hydraulic pressure.
A kind of flow automatic control method of flow automatic control ball valve, the flow automatic control ball valve have above-mentioned flow from ball-handling
The limiting structure of valve, before (1) water flowing, slide valve 12 rises to extreme higher position under the action of spring 18, at this time valve port V standard-sized sheet；
After water flowing, pressure water enters throttle orifice H front cavity through water inlet d, seven C7 of cavity, flat hole b, annular housing five C5 and elongated slot a
Three C3, and two C2 of four C4 of cavity and cavity is entered by elongated slot a, the pressure water action in four C4 of cavity is in slide valve 12
Top, the pressure water action in two C2 of cavity is in the top of diaphragm 14, since diaphragm 14 and slide valve 12 are connected, because
This band movable pulley 12 moves downward, and valve port V is turned down, and throttling action increases, and the pressure in three C3 of cavity is made to be lower than the pressure of flat hole I
Power, meanwhile, the pressure water of apopore E enters cavity six through vertical aperture h1, connection aperture h2 and radial hole h3 after throttle orifice H
In C6, the lower section of diaphragm 14 is acted on, when the setting dynamic balance for the power and spring 18 for acting on diaphragm upper and lower, slide valve 12
In ideal design position, at this point, pressure difference △ P=F/S before and after throttle orifice H, the setting power of F- spring 18, S- diaphragm in formula
14 active area；(2) when intake pressure P1 is increased, since the moment slide valve 12 in pressure rise has little time to act, because
Pressure in three C3 of this cavity also increases, and the pressure in two C2 of four C4 of cavity and cavity also accordingly increases, and acts on slide valve
The power of 14 top of 12 tops and diaphragm increases, and the stress balance of slide valve 12 is destroyed, and slide valve 12 moves down, and valve port V subtracts
Small, the pressure that throttling action increases in three C3 of cavity decreases, until restoring to original value, keeps △ P=P2- P3 constant；
Conversely, the pressure in three C3 of cavity also decreases when intake pressure P1 is reduced, slide valve 12 under the promotion of spring 18 on
It rises, valve port V increases, and throttling action weakens, the pressure rise in three C3 of cavity, until restoring to original value；(3) as throttle orifice H
When the pressure P3 of apopore E is increased afterwards, is increased, pushed away by the Simultaneous Pressure in vertical aperture h1, connection aperture h2, six C6 of cavity
Dynamic diaphragm 14 and slide valve 12 move upwards, and valve port V increases, and throttling action weakens, and the pressure in three C3 of cavity increases, and make △
P=P2- P3 is remained unchanged；Conversely, slide valve 12 moves downward, and valve port turns down, cavity three when the pressure P3 of apopore E is reduced
Pressure in C3 decreases, and remains unchanged △ P=P2-P3；(4) the pressure water of inlet opening I through water inlet d, seven C7 of cavity,
Flat hole b, cavity C5, elongated slot a, throttle orifice H and apopore E downstream supply water；Since uniform-pressure-drop valve is to the pressure at bis- end throttle orifice H
Power carries out pressure compensation, therefore regardless of import and export hydraulic pressure fluctuates, the pressure difference before and after throttle orifice H can be made to remain unchanged, therefore energy
Maintain stable flow；(5) pressure difference at bis- end throttle orifice H can be set by the precompression of adjustment spring 18, and rotation is adjusted
Screw rod 22 is pressed, pressure regulation swivel nut 19 can be made to move up and down, to reach the precompression of adjustment spring 18.Below to throttle orifice H bis-
The pressure difference △ P at end is calculated:
When slide valve 12 is in certain equilbrium position, the stress balance equation of slide valve 12 are as follows:
P2×S+G±FM=P3 × S+ k(Xo+X)
That is: (P2-P3) × S=k(Xo+X)-G ± Fm ... (1)
In formula:
Pressure before P2--- throttle orifice H
Pressure after P3---- throttle orifice H
The effective active area of S--- diaphragm 14
The weight of the parts such as G--- slide valve 12 and spring base 25
FM--- frictional force when slide valve 12 moves
K --- spring rate
Xo---- sets the amount of spring compression under pressure difference
The additional variation of spring can just be born when hydraulic pressure changes before and after X---- throttle orifice H.
In order to simplify design, because of weight G and frictional force FMThe setting power very little of opposite spring, therefore negligible, (1) formula
It can simplify are as follows:
△ P=P2-P3=k Xo/S+ k X/S ... ... .(2)
Due to using biggish diaphragm area S, lesser rigidity k and biggish decrement Xo in the design, and
And before and after the H of hole when variation in water pressure spring additional variation very little, therefore k Xo/S also can be neglected,
(2) formula can simplify are as follows:
△ P=P2-P3=kXo/S=F/S ... .(3)
F=kXo is the setting pressure of spring 18 in formula.
In addition to the implementation, within the scope of the claims of the present invention and the specification, skill of the invention
Art feature or technical data can be reselected and be combined, to constitute new embodiment, these are all art technologies
Personnel are without carrying out what creative work can be realized, therefore the embodiment that these present invention are not described in also should be regarded as this
The specific embodiment of invention and within protection scope of the present invention.
Claims (5)
1. a kind of flow automatic control ball valve has ball valve and uniform-pressure-drop valve, ball valve has four-way valve body (1), valve body right end through-hole
Outside be annular end face, the through-hole of valve body left end cylinder is apopore (E), be located on same level axis with right end through-hole,
On same vertical axis, two axis intersect vertically the through-hole of upper and lower cylinder, be equipped in the inner cavity of valve body (1) sphere (2) and
Valve seat (3) is equipped with upper valve rod (5) in the through-hole of upper shell；It is characterized by: the neck of valve body (1) the lower through-hole cylinder has
Convex block one (G1) is drilled with vertical aperture (h1) on convex block one, and the vertical aperture is connected to apopore (E)；The sphere (2)
It is machined on the ball wall of left side with throttle orifice (H), the water inlet (d) of ellipse is machined on the ball wall position to the left of right side；It is described
Before uniform-pressure-drop valve is connected on throttle orifice (H), including bottom cover (13), diaphragm (14), the slide valve being connected with diaphragm (12),
Regulator is equipped in cavity six (C6) between bottom cover (13) and diaphragm (14)；The diameter of valve body (1) right end through-hole is slightly larger than
The diameter of sphere (2).
2. flow automatic control ball valve according to claim 1, it is characterised in that: there is a blind hole in the lower end of the sphere (2), blind
The center line in hole is consistent with the vertical center line of sphere (2), and left and right side is respectively equipped with symmetrical, the identical spherical crown shape of shape
Cavity three (C3) and spherical crown shape cavity seven (G7), the center line of two cavitys is consistent with the horizontal center line of sphere (2), and point
It is not communicated by elongated slot (a) and flat hole (b) with blind hole, elongated slot (a) extends to aperture from the bottom of blind hole；The throttle orifice
(H) it is communicated with the cavity three (C3) of spherical crown shape, the water inlet (d) communicates with the cavity seven (C7) of spherical crown shape.
3. flow automatic control ball valve according to claim 2, it is characterised in that: the slide valve (12) is by piston and lower valve rod group
At, top tool there are two having certain intervals, diameter identical and piston in same center line, two piston centres have small axis to be linked to be
One, spacing distance are greater than flat hole (b) width, form ring-shaped cavity five (C5) between two-piston；The piston slide fit is in sphere (2)
Blind hole in, top land has a small boss so that cavity three (C3) when slide valve (12) is located at top by elongated slot (a) with
The cavity four (C4) of top land communicates.
4. flow automatic control ball valve according to claim 3, it is characterised in that: the stud that the slide valve lower valve rod passes through end
Pressing plate (27), spring base (25) are connected with diaphragm (14) with nut two (24), the edge that diaphragm (14) thickeies is sandwiched in
Between the flange of valve body (1) lower end and the flange of bottom cover (13), and pressed by several pairs of bolts (15), gasket (16) and nut (17)
Tightly in the annular groove of valve body (1) lower flange end face；Regulator includes: screw press (22), is screwed with screw press
Pressure regulation swivel nut (19) and spring (18): the flange of the bottom cover (13) is equipped with convex block two (G2), is drilled with connection aperture above
(h2) it is connected with the vertical aperture (h1) of valve body (1), and is drilled with radial hole (h3), apopore (E) is made to be connected to cavity six (C6)
；The outer end for connecting aperture (h2) and radial hole (h3) is blocked with ball (26)；Plane bearing (20) is to mitigate rotation pressure regulation
Torque when screw rod (22).
5. flow automatic control ball valve according to claim 1 or 2 or 3 or 4, it is characterised in that: the throttle orifice (H) and water inlet
The relative position of mouth (d) is: when throttle orifice (H) standard-sized sheet, one side of water inlet (d) is overlapped with the internal diameter of valve seat (3)；Work as rotation
Sphere (2), after throttle orifice (H) completely closes, the another side of water inlet (d) is overlapped with the another side of valve seat (3) internal diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810739028.5A CN108916439B (en) | 2018-07-06 | 2018-07-06 | Flow automatic control ball valve and flow automatic control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810739028.5A CN108916439B (en) | 2018-07-06 | 2018-07-06 | Flow automatic control ball valve and flow automatic control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108916439A CN108916439A (en) | 2018-11-30 |
| CN108916439B true CN108916439B (en) | 2019-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810739028.5A Active CN108916439B (en) | 2018-07-06 | 2018-07-06 | Flow automatic control ball valve and flow automatic control method |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110822146B (en) * | 2019-06-17 | 2024-04-26 | 杭州春江阀门有限公司 | Constant-difference pressure reducing valve for stabilizing flow of regulating valve |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3542331A (en) * | 1968-05-17 | 1970-11-24 | Otis Eng Corp | Valves |
| CN102829222A (en) * | 2012-08-17 | 2012-12-19 | 浙江盾安阀门有限公司 | Pressure-difference-variable flow control valve |
| CN203202331U (en) * | 2013-05-03 | 2013-09-18 | 天津市塘沽津滨阀门有限公司 | Dynamic electric balance valve |
| CN104747747A (en) * | 2013-12-30 | 2015-07-01 | 丹佛斯公司 | Valve |
| CN208634460U (en) * | 2018-07-06 | 2019-03-22 | 杭州春江阀门有限公司 | Flow automatic control ball valve |
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| CN108916439A (en) | 2018-11-30 |
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